Hinge



,' T. v. BOYLE March 28, 1939.

HINGE 2 Sheets-Shea Filed March 29, 1958 INVENTOR. 7711mm suBo e w m w A 2 Sheets-Sheet T. V. BOYLE HINGE Filed March 29, 1938 March 28, 1939.

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INVENTOR.

ATTORNEYS Patented Mar. 28, 1939 UNITED STATES PATENT OFFICE Application March 29,

1 Claim.

An object of the invention is to provide an improved door hinging mechanism so mounted and concealed below the door that the operating parts are protected from the elements.

It is also an object of the invention to give to the construction of a sidewalk door and the like,

a plain surface free from stumbling-blocks, thus eliminating the hazards of accidentally or unexpectedly tripping in walking on, over and along the sidewalk door when placed in the sidewalk.

It is also an object of the invention to eliminate the binding and twisting of the door when hinged in the door frame.

Other objects of the invention will appear from the following descriptions.

The invention and its aims and objects will be clearly understood from the following description of my novel device, and one illustrative form of apparatus for carrying out the same is illustrated in the accompanying drawings, the true scope of the invention being more particularly pointed out in the appended claim.

In the said drawings, like parts are indicated by like reference characters:

Figure 1 is a top view of a sidewalk door and frame with a plain surface.

Figure 2 is a sideview of the hinge, and a fragmentary sectional view of the sidewalk door and frame.

Figure 3 is a cross sectional view taken in a plane indicated by line A-A in Figure 2.

Figure 4 illustrates in perspective an embodiment of the bracket.

Figure 5 is a plan view of the hinge and bracket.

Figure 6 shows the position of the hinge members shown in Figure 2 when the door is open.

Number In is a sidewalk frame member of any suitable practical configuration closed by a door H, which may be of plain sheet steel or other suitable material, or have a non-slip top surface, such as a diamond checkered top making it safe for pedestrians to walk upon. It is to be understood that the construction of the sidewalk door and. frame is not claimed per se.

Number I2 is a bracket removably attached to the frame, and l3, l4, l5, and I6 are spaced lug members forming the bracket.

The lugs are provided with an upper bore l1, and a lower bore 18 adjacent their extremities. The upper bore is provided to receive the upper stub shaft IS on which the hinge member 25 is fulcrumed, while the lower bore is provided to receive the lower shaft 20 on which the links 4| and 42 are fulcrumed.

Numbers 2| and 22 are spaced longitudinally 1938, Serial No. 198,726

extending stiffening or guiding members fixed to the underside 23 of the door in any suitable practical manner. These members also provide a guide-way 24 for the hinge member 25.

Number 25 is a hinge member, and is free from direct attachment with the underside of the door. It has its upper portion 26 mounted in the guideway provided therefor by the stiffening or guiding members.

The end 2'! of the hinge member is fulcrumed in the bracket on the upper stub shaft. The guide-way is provided to keep the hinge member 25 in proper sliding relation with the stiffening or guiding members.

Numbers 28 and 29 are complementary longitudinally extending bar members, positioned one on either side of the hinge member 25, spaced below the stiffening or guiding members and in parallelism therewith. The bar members provide a guide-way for the lower portion 30 of the hinge member that slides therein.

Numbers 3|, 32, 33, and 34 are oppositely-disposed and symmetrically arranged inclined lever arms, pivotally connected adjacent their upper ends by pivots 35 and 36 to the stiffening or guiding members, and intermediate their length pivotally connected to the hinge member 25 at 31 and 38. The lower ends of the lever arms are pivotally connected to the oppositely-disposed complementary longitudinally extending bar members 28 and 29 by pivots 39 and 40.

Numbers 4| and 42 are oppositely-disposed link members articulated with the longitudinally extending bar members on pivot 39 and fulcrumed at their other ends on the lower shaft 20 provided therefor in the bracket. 43 and 44 are spacers adapted to hold the link members in proper position in the bracket. 45 is a pivoted latch member mounted on the main hinge member 25. The latch member 45 is provided with a notched engaging end for the reception of the pivot 36 when the hinge is closed to lock the hinge, as shown in Figure 2. When the hinge is in its full open position, the latch member 45 is manipulated so that the notched engaging end engages the pivot or pintle 40, which locks the hinge in its open position as shown in Figure 6. The free end of the latch member may be of suitable hook-shaped configuration if desired. Number 46 is a handle, provided to open and close the door. 50

It will be noted that the link members control the lever arms and prevent the opening of the door except to a position slightly beyond the vertlcal.

It is believed that the operation of the mechanism as a whole will be clear, in view of the foregoing description which has been given in connection with the construction of the same.

Other applications and other modifications are contemplated within the scope of the present invention, as will be apparent to those skilled in the art. It is therefore to be understood that the embodiments herein disclosed are to be regarded as illustrative of the invention, and the appended claim is to be construed broadly except as limitations may be necessary in view of the prior art.

What I claim as my invention and desire to secure by Letters Patent is:

A hinge comprising; a bracket having a plurality of spaced lug members having bores therein adjacent their upper and lower extremities, an upper shaft and a lower shaft in said bores, a longitudinally extending main hinge member pivotally mounted at one end on the upper shaft, upper longitudinally extending guiding members arranged on opposite sides of the main hinge member, lower longitudinally extending bar members arranged on opposite sides of the main hinge member in parallelism with the guiding members, a plurality of pairs of oppositely disposed inclined lever arms connected by pivots with the guiding, bar and hinge members, one pair of the aforesaid plurality of pairs being arranged adjacent the bracket, another pair being arranged remote from the pair adjacent the bracket, the upper guiding members and the lower bar members providing a guideway for the main hinge member, said main hinge member being slidable in the aforesaid guideway, oppositely arranged link members, the lower bar members each having their ends nearest the bracket pivotally articulated with one end of the oppositely arranged link members, and the other end of each link member being pivotally mounted on the lower shaft in the bracket, a locking member pivotally mounted on the main hinge member and having a notched end adapted to engage the pivot on which the upper extremity of one of the pairs of inclined lever arms is mounted, said looking member being adapted to lock the hinge in its closed position, and being further adapted to prevent the closing of the hinge when open by engaging the pivot on which the lower extremity of the said one pair of inclined lever arms is pivotally mounted.

THOMAS V. BOYLE. 

